Vibration isolation unit



Filed H07. 16. 1958 Patented Sept. 19, 1939 UNITE STA'EEE eATENT OFFICE1 Claim.

This invention relates to a novel vibration isolation unit of the typeintended to be employed in connection with machines which are supportedon a frame, which may or may not include a concrete foundation, andwherein the frame and foundation, together with the machine, is to beraised from the floor or sub-base by manipulating the damper itself insuch a way as to lift the entire assembly to its yieldingly supported orsuspended position.

A primary object of the invention is to provide a unit of compact designand sturdy construction which may be readily fabricated and assembled tomeet the requirements of a particular installation. In that connection,the unit provides a housing for the coil spring used in this type ofanti-vibration unit thereby protecting the spring while in use, and, atthe same time, providing ready accessibility for adjustment.

A further object of the invention is to provide a construction whichpermits extremely critical adjustment of the springs to meet operatingconditions at any time.

With the above and other objects in view which will more readily appearas the nature of the invention is better understood, the same consistsin the novel construction, combination and arrangements of partshereinafter more fully described, illustrated and claimed,

A preferred and practical embodiment of the invention is shown in theaccompanying drawing, in which:

Figure 1 is a vertical cross sectional view of an installation embodyingthe present improvements.

Figure 2 is a vertical sectional view taken on the line 22 of Figure 1.

Figure 3 is a detail plan view of a modification where the foundationblock rests on the channel irons which form a part of the foundation.

Figure 4 is a detail view illustrating a modified type of installationalso using the present invention.

Similar reference characters designate corresponding parts throughoutthe several figures of the drawing.

The unit illustrated in the drawing comprises a base plate A forsupporting a spring S contained within a tubular housing B, the saidhousing being provided in its upper end with suitable adjusting means C.

Referring first to the base plate A it will be observed that the same isprovided with suitable marginal openings for receiving the anchor boltsI to anchor or secure the plate to the floor or at its lower end asindicated at w to the web of 19 a channel iron 4 or other structuralmember forming a part of the machinery base or foundation. Thus, it willbe apparent that the tubular member B which constitutes a housing forthe spring S is rigidly united with a portion of the machinery base orfoundation. The upper end of the tubular member B is preferably formedto detachably connect, as, for example, by the threads 5, with themating end of an interiorly threaded tubular section 6 which forms apart of a cap or covering for the tubular member. The member 6 is alsopreferably internally threaded as indicated at 1 thereby to receive themating threads of a cover disc 8. This cover disc is provided withsuitable tool engaging recesses 8 and is also provided with a threadedopening l0 formed in an enlarged lug or boss II. The threaded openingll! of the cover disc 8 receives the threaded adjusting screw 0 which ispreferably provided with a tool slot in the conventional manner. Thescrew C has its lower end in engagement with the central recessedportion of a compression plate l2 which is formed with a centering bossl3 for entering the hollow core of the spring S.

In practice the tubular member or damper housing B is first welded tothe channel or other structural part 4 of the base. The base plates lare then correctly positioned and anchored to the floor or sub-base. Ifthe present invention is to be used in connection with a machinery basehaving a concrete foundation, the entire sub-base or floor between thebase plates I is covered with several layers of oil paper. The

' structural members 4 having the damper housings B welded thereto arethenplaced over the base plates l and the inner flanges of the channelor other structural member is caulked to prevent outward seepage ofconcrete. A wood form is then constructed around the perimeter of thefoundation to the level of the damper cap 6 which, of course, is fittedto the damper housing B before the operation of pouring the concretestarts. The spring S is then placed in the housing with its lower endresting on the boss 2 of the base plate I, its lower open end alsoreceiving the lug or collar 3. The compression plate I2 is then placedon top of the spring S, and the damper cover 8 is then screwed into thethreads 1 of the cap 6. The adjustment screw C may then be inserted inthe threaded opening ID of the cover. After the foundation block has setit is only necessary to rotate the screw C to raise the entirefoundation F from the floor and thus support it directly on the springsS.

It will, of course, be understood that any desired number of damperunits may be used in a given installation, and afterethey are onceinstalled it will be seen that the adjustment screw C is alwaysavailable or accessible for rotation to efiect any desired adjustment ofthe spring S.

While Figures 1 and 2 illustrate the concrete foundation F as envelopingthe tubular spring casings or housings B2, it will be seen from Fig. 3that the concrete foundation F may be directly installed on the channelirons 4a without surrounding the tubular members.

As further illustrating the range of application of the invention,reference may be made to Figure 4 from which it will be observed thatthe unit B which is of the same construction as the unit shown in Fig. 2may be used in an installa tion where it is not necessary to employ aconcrete foundation. In this case an angle member Sb may be used inplace of a channel member. The damper housing or barrel which houses thespring may, therefore, be welded directly to the upper face of oneflange of the angle member which is carried by the beam or other supportM of the machine base. In this instance, the machinery base, includingthe structural members I4, is constructed while resting on the sub-base.When the foundation is complete and the machinery installed thereon, theentire assembly may be lifted from the floor or sub-base in the samemanner as that described in connection with Figure 2.

Without further description, it is thought that the features andadvantages of the invention will be readily apparent to those skilled inthe art, and it will, of course, be understood that changes in the form,proportion and minor details of construction may be resorted to, withoutdeparting from the spirit of the invention and scope of the appendedclaim.

I claim:

Means for isolating machinery bases from a sub-structure, comprising, incombination, a structural member for the base, an angle iron having itsvertical leg secured to the said structural member whereby itshorizontal leg extends outwardly of said member, an oblique filletmember connecting the vertical and horizontal legs of the angle iron,and an isolation unit mounted outwardly of the base, said unit includinga base plate mounted on the sub-structure beneath said horizontal flangeof the angle iron, a tubular member carried by the upper face of theangle iron, a coil spring having its lower end resting on said baseplate and the body of said spring being housed within the tubularmember, and means in the upper end of the tubular member for varying thecompression of the spring.

SIEGFRIED ROSENZW'EIG.

